So, we all know that we shouldn't text while driving. But in case you thought that checking Google Maps was acceptable, a Californian judge has made it clear that isn't the case.

Despite the fact that many cars have touchscreen satellite navigation systems, a Californian appeals court has ruled that using a mobile phone to view a map while driving is still a big no-no. Indeed, it's the hands-on use of a mobile phone which is the problem, as the ruling explains:

"Because it is undisputed that appellant used his wireless telephone while holding it in his hand as he drove his vehicle, his conduct violated Vehicle Code section 23123, subdivision (a)."

You can read the full ruling below. But in the meantime, it clearly pays not to use Google Maps at the wheel—or, more accurately, not to touch your phone while doing so—especially in California. [California Appeals Court Ruling via All Things D]